50 A VENATION AL STUDY OF THE ZYCiOPTERA 



6 (i). Secondarx- sectors few; a tendency to only one row of cells between Mu and 

 Mo, if two rows, it is for a short distance only, M1+2 forking at less than one-half 

 the distance from the subnodiis to the tip of the wing. Cua longer, ending at 

 one-half or more than one-half of the distance from the fork of Mi+-. to the tip 

 of the wing, at least in the fore wing. Cu-> iinbranched. One or two rows of cells 

 between Cu2 and the posterior wing margin. One row of cells between Ri and 

 Mi+2 before the fork of the latter 7 



7 (8). The nodus at one-fifth of the wing length. The hind wing, at least, tends to 

 ha\-e two rows of cells between Mia and M2 for a short distance. Mi has several 

 short sectors at its end; there are two rows of cells posterior to.Cu2. Mexico to 

 Colombia. (Fig. 49.) Pseudostigma Selys, i860 



8 (7). The nodus at one-fourth to one-fifth of the wing length. One row of cells 

 between M^ and M2. No sectors more than a few cells long, except between Mi 

 and Mia. M4 usually unbranched. One row of cells between Cu2 and the pos- 

 terior wing-margin. West Indies and Mexico to Ecuador. (Fig. 50). 



Mecis togas ter Rambur, 1S42 



Key to the Genera of the Subfamily Megapodagrioniuae 



1 (2). Antenodals three to five, postnodals over fifty; venation very complex, many 

 supplementary sectors from Mi to the posterior margin of the wing. About ten 

 cross-veins under the stigma. Quadrangle almost rectangular at both ends. 

 Wings not petioled to the level of the arculus. Panama to Costa Rica. (Fig. 51 .) 



Thaumatoneura McLachlan, 1897 



2 (i). Antenodals two to three, postnodals generally not over thirty; venation 

 simpler; supplementary sectors not usually present between Mi and Mia, and 

 Cui and Cui. Cross-veins under stigma six or fewer. Quadrangle generally 

 acute di'^tally. Wings usually petioled beyond the level of the arculus 3 



3 (4). Rs arising one cell before the subnodus, Ms about one-half the distance be- 

 tween the arculus and the subnodus. Supplementary sectors Mia to Cu2. \\'ing 

 petioled to the level of one-third to one-half of the distance between the arculus 

 and MA. Formosa. (Fig. 52.) Rhipidolestes Ris, 191 2 



4 (3) . R„ not arising before the subnodus. M3 arising nearer the subnodus than the 

 arculus '"^ 



5 (30). R. arising at or ven.' near the subnodus, Ms at least one cell before the sub- 

 nodus 



6 (7). .'\rea posterior to Cwi with four or fixe rows of cells. Wing petioled to or 

 beyond the le\el of the arculus. Supplementary sectors from Mia to Cui or Cu2. 

 Malaysia and Australia. (Fig. 53-) Podoptery.x Selys, 1871 



7 (6). Area posterior to Cu2 with one or two, rarely three rows of cells. 8 



8 (19). Wing not petioled to the level of the arculus, it may be almost so in Tri- 

 neuragriou, a genus with a third antenudal 9 



9 (14). Short sectors present between R, and M3 as well as some of the other longi- 

 tudinal veins ^^^ 



